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Bhardwaj, V.*; 谷田 聖; Belle Collaboration*; 他191名*
Physical Review D, 99(11), p.111101_1 - 111101_8, 2019/06
被引用回数:6 パーセンタイル:41.49(Astronomy & Astrophysics)We report a search for and in decays. We set an upper limit of and at 90% confidence level. We also measure at 90% confidence level. The results reported here are obtained from events collected at the resonance with the Belle detector at the KEKB asymmetric-energy collider.
Seong, I. S.*; 谷田 聖; Belle Collaboration*; 他191名*
Physical Review Letters, 122(1), p.011801_1 - 011801_8, 2019/01
被引用回数:16 パーセンタイル:75(Physics, Multidisciplinary)We report on the first Belle search for a light -odd Higgs boson, , that decays into low mass dark matter, , in final states with a single photon and missing energy. We search for events produced via the dipion transition , followed by the on-shell process with , or by the off-shell process . Utilizing a data sample of 157.3 10 decays, we find no evidence for a signal. We set limits on the branching fractions of such processes in the mass ranges GeV/ and GeV/. We then use the limits on the off-shell process to set competitive limits on WIMP-nucleon scattering in the WIMP mass range below 5 GeV/.
Jia, S.*; 谷田 聖; Belle Collaboration*; 他191名*
Physical Review D, 98(9), p.092015_1 - 092015_8, 2018/11
被引用回数:7 パーセンタイル:41.87(Astronomy & Astrophysics)Using data samples of 89.5~fb, 711.0~fb, and 121.4~fb collected with the Belle detector at the KEKB asymmetric-energy collider at center-of-mass energies 10.52 GeV, 10.58 GeV, and 10.867 GeV, respectively, we study the exclusive reactions () and . A significant signal is observed for the first time at GeV with a significance of including systematic uncertainties. No significant excesses for , , and final states are found, and we set 90% credibility level upper limits on the Born cross sections () at 10.52 GeV, 10.58 GeV, and 10.867~GeV. Together with cross sections measured by BESIII at lower center-of-mass energies, the energy dependency of is obtained.
堀口 朋裕*; 谷田 聖; Belle Collaboration*; 他191名*
Physical Review Letters, 119(19), p.191802_1 - 191802_8, 2017/11
被引用回数:17 パーセンタイル:74.18(Physics, Multidisciplinary)We report the first evidence for isospin violation in and the first measurement of the difference of asymmetries between and . This analysis is based on the data sample containing pairs that was collected with the Belle detector at the KEKB energy-asymmetric collider. We find evidence for the isospin violation with a significance of , , where the third uncertainty is due to the uncertainty on the fraction of to production in decays. The measured value is consistent with predictions of the standard model. The result for the difference of asymmetries is , consistent with zero. The measured branching fractions and asymmetries for charged and neutral meson decays are the most precise to date. We also calculate the ratio of branching fractions of to .
Yang, S. B.*; 谷田 聖; Belle Collaboration*; 他191名*
Physical Review Letters, 117(1), p.011801_1 - 011801_6, 2016/07
被引用回数:32 パーセンタイル:85.28(Physics, Multidisciplinary)We report the first observation of the decay using a 980 fb data sample collected by the Belle detector at the KEKB asymmetric-energy collider. This is the first observation of a doubly Cabibbo-suppressed decay of a charmed baryon. We measure the branching ratio of this decay with respect to its Cabibbo-favored counterpart to be , where the uncertainties are statistical and systematic, respectively.